Current Mirroring Circuit for Simultaneous OLED Pixel Sensing
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Solution Overview
Problem
Existing OLED pixel sensing technologies require individual sensing of thousands of pixels, leading to prolonged manufacturing time and increased costs due to differences in pixel characteristics, which affects image quality and brightness.
Innovation Solution
A current mirroring circuit that simultaneously senses the characteristics of multiple OLED pixels by using N-type and P-type output transistors to supply test currents with uniform magnitudes to output terminals, reducing sensing errors and manufacturing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual sensing of OLED pixels is performed, then sensing accuracy is improved, but manufacturing time increases
Solution Approach 1:
The patent merges multiple pixel sensing operations into a single parallel execution cycle. By designing the sensing circuit to simultaneously sense multiple pixels (e.g., 100+ pixels) in one operation, it combines what would otherwise require sequential individual sensing into a unified parallel process, thereby maintaining accuracy while dramatically reducing manufacturing time
Solution Approach 2:
The sensing circuit is segmented into multiple independent sensing channels that operate in parallel. Each channel can sense a specific pixel or group of pixels simultaneously, allowing the system to process multiple pixels at the same time rather than sequentially, thus resolving the time-accuracy tradeoff
2Productivity
If test currents are supplied to multiple output terminals, then sensing speed is improved, but current uniformity deteriorates
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting current mirror ratios and compensation parameters for each output terminal based on their specific electrical characteristics. By changing these parameters adaptively, the system maintains current uniformity across all terminals even when supplying test currents to multiple pixels simultaneously, thus resolving the contradiction between sensing speed and current uniformity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for simultaneous sensing of multiple OLED pixels, reducing manufacturing time and costs while maintaining accurate sensing and minimizing the need for post-processing corrections.
Implementation Method 1
a current mirroring circuit that includes: a current generation unit configured to generate a first current and a second current; and a plurality of current mirroring units each including an N-type output transistor configured to mirror the first current and a P-type output transistor configured to mirror the second current
Data Source
AI summary
The present invention provides a technology of simultaneously sensing characteristics of a plurality of OLED pixels. Further, a current mirroring circuit for sensing characteristics of OLED pixels can be applied to fields other than sensing characteristics of OLED pixels, and the current mirroring technology can output sensing currents having a uniform magnitude within a predetermined error range to a plurality of output terminals.